The team concluded that the more men between 20 and 40 years old ejaculate, the less risk they have of developing prostate cancer. Men who ejaculate more than five times a week would reduce the risk of developing prostate cancer throughout their lives by a third. Prostate and masturbation According to the authors of this study, this sexual activity would limit the seminal fluid. Certain compounds of this fluid that is part of the sperm could have carcinogenic properties, in case of accumulation in the prostate channels.